{"product_id":"doro-primo-365-replacement-battery-37v-1300mah-li-ion","title":"Doro Primo 365 Replacement Battery RCB01 3.7V 1300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDoro Primo 365 — 3.7V Li-ion Replacement Battery (RCB01)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1300mAh Li-ion replacement battery for the Doro Primo 365 smartphone. It carries OEM part number RCB01 and slots directly into the phone's battery bay. Capacity is 4.81Wh — matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrimo 365 platform fit:\u003c\/strong\u003e\n    The Primo 365 runs a single-cell 3.7V Li-ion rail with a fixed connector and BMS handshake tied to the RCB01 part number. Any cell outside this voltage and form factor will be rejected by the charge IC or will not seat correctly in the chassis.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the Primo 365 platform. The BMS accepted the cell, the charge IC reached full termination voltage without fault flags, and the fuel gauge IC tracked state of charge without dropping into error mode.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after installation:\u003c\/strong\u003e\n    On first use, disable any fast-charge accessory and run one full discharge-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state-of-charge register.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Primo 365 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Primo 365 uses a fuel gauge IC that stores a learned discharge curve from the original cell. When a new cell goes in, the IC is still reading against the old curve — so it misreports state of charge, often showing full when the cell is not. One complete discharge-charge cycle forces the IC to rewrite its coulomb counter baseline against the new cell's actual chemistry. Until that cycle completes, percentage readings will be inaccurate. After the first full cycle, the gauge should track within a few percent of real capacity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under load — the modem or screen draws current, and the cell cannot sustain voltage above the BMS cutoff threshold. The phone reads 25% but the cell is already near its voltage floor under that load spike. The BMS trips the output to protect the cell, and the phone shuts off hard. Let the phone cool for two minutes, then power it on and charge immediately to above 50% before next use — this keeps the cell away from the voltage cliff during high-draw events.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404283740250,"sku":"BWCS-DEP365SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404283773018,"sku":"BWCS-DEP365SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404283805786,"sku":"BWCS-DEP365SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DEP365SL-1.webp?v=1779369550","url":"https:\/\/batteryweb.com\/products\/doro-primo-365-replacement-battery-37v-1300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}